Improvement in nuts for screw-boets



, the parts, is

A represents a screw-bolt, of ordinary hat eine.

NA'lH'A-N4 THOMPSON, OF

- BROOKLYN, NEW YORK.

Letters Patent No. 99,729, dated February 8, 1870.-

w mpnovnivmnrm nous ron SCREW-Bours.

The Schedule referred to n"these Letters P atent and making part of 'thesame To all whom it may concern:

Be it known that I, NATHAN THOMPSON, of Brooklyn, in the county 'ofKings, and State of New York, have invented a new and useful Improvementin Nuts for Screw-Bolts, applicable to the fish-joints ofrailroadf;barsand other purposes, of which the following is a full, clear, andexact description, reference being had to the accompanying drawing,forming part of this specification, and in which- Figure 1 represents a`'transverse section, through a railroad-bar, with fishing-platesapplied thereto, and secured bya bolt having my improved nut fitted toit';

Figure 2, a longitudinal view of the bolt, detached;

Figures 3 and 4, an edge and inner-mee view ofthe interior portion .oftherilnproved nut; j

. Figures 5 and 6, an edge and outer-face view of the exterior portionof said nut; and Y i Figure 7, a face view of Va spring used in the nut.

' Similar letters of reference indicate' corresponding parts. t

My invention, while applicable to screw-bolts, rods,V

or bars, generally, irrespective of the purpose to whicl-iV the same maybe applied, will be best explained, so far as regardsmaking clear itsadvantages, by associating vit with screw-bolts applied to securing thesl1-joints of railroadbars, and will here be desclibed in suchconnection. lhe same, however, is applicable to an yboltfastenings, as,for instance, those used in various parts lof locomotive and othersteam-engines, in which either expansion and lcontraction, as producedby variation of temperature or jar, as arising from the working of aptto loosen the' bite of the nut on the surface itis screwed against.' Tothisrend,

n The improvement consists of a compound nut, the

construction an'darrangement of parts of which, rela- 4`tivelyto eachother, as hereinafter described, consti` tutes the subjeetof theinvention.

In the accompanying drawing-J t or any snitablel construction, appliedto secure the sh-plates B B of a railroad-bar C.

My improved nut, which is represented as fitted on the screw-'end ofsaid bolt, to ett'ect the tightening up of the same, consists of aninner nut, D, made to' fit the screw-,thread of the bolt and outer-nutfollower or shell E, together with au enclosed and interposed spring,11", preferably made of vulcanized India rubber.

The inner nut D is of hexagonal or other suitable shape for a portion,a, of its length, to 'secure its turning with and being turned bytheouter-nnt follower or shell E,which iscorrespondingly shaped, at b,tot said inner nut, with freedom to slide or play longitudinally over it,and which outer shell is `of nut or other Vsnit-able shape on itsexterior, to facilitate it-s lbeing turned and turning the inner nut.

' The interior of the' shell E, at its rear portion c, is preferably ofcylindrical form, andthe rear exterior portion d of the inner nut D ofcorresponding shape, with, it may be, a collar, e, at back, arranged toallow of backward play to the -shell E when screwing the From thisdescription, and by reference toy iig. l of the drawing, it will be seenthat on turning the compound nut by the shell or follower E, to screw uptheinner nut, the rubber ring or spring F is compressed and madetoproduce frictional hold or bearing of the inner face of the follower Eagainst the fish-plate B, and the further the nut D i s screwed up thetighter or closer such elastic frictional hold of the follower on saidplate becomes, thereby providing alike for expan-' sion of the bolt orjar to the fastening, without freeing the compound nut frombearing-pressure on the plate, or from getting loose-on the bolt, and inthis re spect heilig much more reliable than wiring the nut, and`dispensing with the usual locknut as used in many bolt-fastenings.

It is an important element in this compound nut that the spring F isencased and protectedV by the follower, and so that it is restrainedfrom being expanded vlaterally without giving out useful effect on saidnut.

The spring F may in some cases be made of cork, Vor even 4soft, wood, ora spiral or other metallic spring 4may be-used; but I do not confinemyself to any particular material, so long as it is of va yielding orelas-` `tio character.

By the special construction of the compound nut as herein shown anddescribed, the fit of the hexagonal or angular portion uof the inner nutD within the correspondingly-shaped portion b ofthe follower E not onlyinsures the turning ofthe nut by the follower, but the latter preventsoil applied to the screw-thread of the bolt o'r its nut from passing tothe rubber or spring F, to injure it.

The t of the circular portion d of the nut within the like-shaped recessc in the follower, and application of an outside ange, head, or collare, also provides for ,exclusion of cil and' dirt from the outside, andthe collar e gives a neat iinish to the compound nut; also, the circularconstru'ction of the parts d and c allows of an annular spring,F, beingused; What is here claimed, and desired to be secured by Letters Patent,is-- The 4outer shell cr follower E, constructed with a circular recess,c, and reduced hexagonal or angular inner-,cavity or portion b, incombination with the nut` D, constructed as at a and b, ,to correspond,and formed with an outer head or collane, for operation in connectionwith an annular or other spring, F, substantially as shown anddescribed. Witnesses: NATHAN THOMPSON.

HENRY T. BROWN, 4

FRED. Haynes.

